Boiler blow-off valve



C. C. ONEIL;

BOILER BLOW-QFF VALVE- APPLICATION FILED SEPT. 12, 1919.

" 1,340,790, Patented May 18,1920.

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COLIN G. ONEIL, OF SARNIA, ONTARIO, CANADA.

BOILER BLOVT-OFF VALVE.

Specification of Letters Patent.

Patented May 18, 1920;

Application filed September 12, 1919. Serial No. 323,347.

To all whom it may concern:

Be it known that I, COLIN C. ONEIL, of the city of Sarnia in the county of Lambton, Province of (lntario, Canada, have invented certain new and useful Improvements in Boiler Blow-Off Valves, of which the following is a specification.

Considerable trouble is experienced with ordinary blow-off valves due to the fact that the valve seats are scratched and darnaged by scale blown out with the water, which makes the valves leaky. Trouble is also experienced in connecting blow-0E valves to the boiler shell so that the joint remains tight. The object of my present invention is to devise a blow-off valve in which these difiicultics are overcome and which may easily be used for refilling the boiler.

I attain my object by means of the constructions hereinaftermore specifically described and illustrated in the accompanying drawings in which- Figure 1 is a longitudinal section of my improved valve;

Fig. 2 a plan view of the same; and

Fig. 3 an elevation taken facing the at taching flange.

In the drawings like numerals of reference indicate corresponding parts in the different figures.

1 is the valve casing, intermediate the ends of which is formed a valve seat 2, which yalve seat is provided with a plurality of ports 3 and a central opening for the passage of the stem 4 of the valve disk 5. The valve disk is also provided with a plurality of ports corresponding to the ports in the valve seat.

The upper end of the valve casing has an opening therein of suflicient size to permit of the introduction of the valve disk, which 0 ening is closed b the threaded cap 6. t will be understooc that the terms top and bottom are used as descriptive. of the .parts when the valve is in the position shown in the drawing with the valve stem substantially vertical which will be the position in which it is ordinarily employed.

Extending from the side of the valve casing above the valve seat is a waterway 7, which waterway at its outer end is sur rounded by an attaching flange 8 having holes formed therein for the bolts or screws by which it is attached to the shell of the boiler.

Surrounding, the opening of" the waterway is a somewhat projecting flat ground surface 9. When the valve is secured in position this flat face engages the ground fiat face of a joint ring. 10. The opposite face of this ring is spherically ground, the opening in the boiler having its edges similarly ground to lit the ring. The advantage of this construction is that an absolutely tight joint may be obtained even though the workmen accidentally tightens up one of the bolts or nuts slightly more than another, the flat faces of the ring and attaching flange always maintaining engagement, while the spherical surfaces in contact may move on one anotheras may be necessary while maintaining perfect contact.

Below the valve seat an outlet waterway is extended laterally. Through the lower wall of this waterway is formed a hole for the passage of the valve stem 4. The valve may thus be operated from below without interference with the discharge from the outlet waterway. The terms inlet and outlet are used having reference to the normal direction of flow through the valve, which will be from the boiler through the waterway 7, through the valve and valve seat and through the outlet waterway 11. On occasions the valve may be used to refill the boiler, in which case the direction of flow will be reversed.

To insure the valve disk contacting properly with the valve seat under all conditions, I provide the coil spring 12 engaging the cap and the valve disk. This spring is normally positioned by the tits 13 extending from the cap and valve disk respectively. It will be seen that the valve may be fully opened by turning the valve stem a onequarter turn. To insure the valve stem being turned exactly to the right extent either way and no farther, I put into the stem a set screw 14 which plays between the two ends of a quadrant-shaped groove formed in the under side of the lower wall of the waterway 11. An opening 15 is provided in the wall of the waterway through which the set screw may be screwed in position.

16 is a handle which may be keyed in position on the valve stem, preferably provided with a slot 17 adjacent its outer end for engagement with a hook or any tool by which the valve stem may be turned.

What I claim as my invention is 1. A blow-off valve comprising a valve casing having a flat valve seat formed interme'diate of its ends provided with a plurality of ports and a central hole for the passage of a valve stem; a laterally directed inlet waterway entirely and at all parts of its length above the valve seat; a laterally directed waterway below the valve seat having a hole in its lower wall for the passage of a valve stem; a cap-closed opening opposite the valve seat through which a valve disk may be inserted; a disk valve located substantially entirely below the inlet waterway and having a plurality of COLIN ooavnm Witnesses:

FRANKLIN L. LEHRING, JAMES F. COLVILLE. 

